Computing machine



Oct. 17, 1933. F. A, HART COMPUTING MACHINE Original Filed Jan, 21, 1927 2 Sheets-Sheet l 1 I l I l lllll ||||||||l|l fil INVENTOR M a. M

WITNESSES ATTORNEY Oct. 17, 1933. F. A. HART COMPUTING MACHINE Original Filed Jan. 21, 1927 2 Sheets-Sheet 2 INVENTOR 5 M 444 BY @Y A/ MIT ATTORNEY WiTNESSES Patented Oct. 17, 1933' COMPUTING MACHINE 7 Frederick A. Hart, Stamford, 001111., assignor to Remington Typewriter Company, N. Y., a corporation of New York Original application January 21, 1927, Serial No. 7

162,473. Divided and this application September 26, 1931. Serial No. 565,263 j 4 Claims. (01. 308-189) My invention relates to computing machines.

In these machines there are parts of the mechanism that are required to move with a considerable degree of precision and at the same time,

especially in computing machines of that class in which the computing mechanism is operated by the keys of a typewriter, it is necessary that the parts move. freely .soxas to offer as little resistance aspossible to the operation of the key. The present invention has for its principal object to improve mechanism of this character in respect to precision of movement and readiness, accuracy and permanency of adjustment, to-

gether with freedom of movement; and to attain these objects with mechanism that may be easily and cheaply manufactured.

To the above and other ends my inventionconsists in certain features of construction andcombinations and arrangements of parts, all of which will be fully described herein and particularly pointed out in the claims.

This application is a division of my prior application Serial No. 162,473, filed Jan. 21, 1927.-

I have shown my invention applied to a Rem- 2b ington combined typewriting andcomputing machine, the general construction and mode of operation of which are well-known in the art. For

the purposes of the present invention the ma.

chine may, if desired, be made as described in the patent to Wahl No. 1,270,471, dated June 25,

1918, except as hereinafter pointed out; In other words, for the purpose of description the invention in the form in which it is set forth herein may be regarded as .an improvement ,in the.

' mechanical structure of the machine described in said patent. In view of what has just been said, the accompanying drawings show only so much of the machine as is necessary to illustrate my improvements.

In said drawings, all of which are more or lessfragmentary,

Figure 1 is a-front view: v Figure 2; a left-hand end view;

Figure 3; a right-hand view in section on the. V r

' passes through the plate 13 by three'ball-b'earing line 3-3 of Figure 1;

Figure 4 is asection on theline 44 of Figure 2 and looking in the direction ofthe arrow at said line. a

Figure 5 is an irregular section approximately on the line 5--5 of Figure 1 and looking down-' ward. i

"Figure 6 is a section about on the line 6- 6 of Figure 1 and looking toward the left.

Figure '1 is a similar view'but with some of the parts'removed.

supported directly or indirectly from plate; 14 .and the right-handend plate, not shown, the

Figure'8 is a view' in section on the line 8-8 W ofFigure'7.- n Figures 4-8 are on a larger scale than Figures 1-3.

The Remington combined'typewriting and com- 00 puting machine comprises a Remington typewriter having attached thereto computing mechanism. of the sort described in-the Wahl patent above, referred to. The actuator. of said computing mechanism comprises a main frame castin 10 secured to the top plate of the typewriter and va number of sheet metal frame'plates projecting in front and rear planes from said casting. 7

Seven of said plates are shown in the; drawings and designated 11, 12, 13, 14, 15, 16 and 17.

Plates 11 and 14 maybe regarded. as the two end plates of the vertical actuator and these are 1 secured respectively to two forwardly projecting lugs, or {brackets 18 and 20'integral with rnain casting 10. Plate-l5 is the left-hand endfplate of the cross actuator, theright-hand end plate 1,

of which is not shown, but in the machinelit is supported on the extreme right-hand end of the casting 10. The frame plates 15, 16 and 17 are I supports consisting of certain cross rods ,or posts, some ofv which are shown and lettered 21, 22, 23 and 24. Eaehof the parts marked 21, 22and 23 consists ofa rod running through all'of'the plates andhaving sleevesor'bushings strung on it to space the ,plates apart. The bracket orplate 11 is fastened to, the main casting by two screw 25 and plate 14 by two screws 26.;- r

Each of the ten numeral keys .ofthe typewriter, has: connectedthereto'; ajlink 1 27, Fig. 6, which at its upper end is pivoted to a; so-called fanf 28,: the, hub, of which is journaled on a cross rod 30 of the vertical actuator.

Each fan operates a corresponding,goose neck' cam which actuates anarm v43 secured to and projecting from agdifferential rock shaft 44 which is journaledin the frame plates, 11 and 14 and which is also supported nea'nits middle where it rollers'9l, 921and 93=' (Figs. l, 6, 7 and 8). This differential rock shaft 44 carriesthe usual peculiar hub structure 45 to whichat 46 is pivoted'the I ,usual gear sector or segment 4'7 which operates the verticalmaster wheel. This gear segmentis arranged to act on the down stroke of the key on}; a drive pinion 48v for addition or .on an auxiliary 'pinion50 for subtraction, saidpinions being in mesh with each other and the formersplined on the shaft 51 of the vertical master wheel'52 which drives the so-called carrying wheels 53 of the vertical totalizers, the last traveling back and forth in unison with the typewriter carriage; all of these parts being and operating the sameas heretofore. V j v "Journaled in the frame plates 15 and 16 is the differential shaft 54 of the cross footer on which the gear sector or segment 55 is mounted. The sector 55 is adapted to mesh for addition with the drive pinion 56 and for subtraction with another drive pinion not-shown, the pinion 56 that it carries, together with its two ball bearings being splined on the shaft 57 of the cross master wheel 58, said shaft journaled in the frame plates and 17, all as heretofore. The two differential shafts are driven in unison by a linkage situated between the plates 14 and '15 and comprising an arm 60 fast on the right-hand end of shaft 44, an arm 61 fast on the left-hand 'end of shaft 54 and a connecting link 62.

All the parts above referred to perform substantially the same functions as heretofore. Th'e'diifer'entialshaft 44 has heretofore had a plain bearing in each of the frame plates 11 and 14 and has been supported at the frame plate 13 by having mounted-thereon a plain bearing 'sleeve. It is necessary that this shaft -move with considerable precision because its function is to "turn the master wheels 52 and 58-as exactly as possible a definite numberof tooth-spaces, depending in each instance on the value of the nu- 'meral key operated. -It is necessary at the same time that this shaft turn quite freely because it is operated rapidly by the down stroke of a typewriter key; -I have therefore mounted this shaft on ball bearings by means well adapted for 'this'situation. p

' The shaft 44 has on its left-hand end and secured thereto in-any suitable way, a ball bearing member '72 which, for the want of a better term, I shall call a cone. Said shaft as shown in Fig. 4, has its left-hand end tapered beginning with the line 71 and inserted forcibly in a tapered opening in said member or cone. The balls 73 run on a suitably shaped part of the cone 72 and also in an internal grooveof suitable form-in a ring 74 setened by two screws '76 to the outside of the frame plate 11 where it is located accurately by dowels 7-7. The plate llitself is cut away as shown in Fig. 2-into, such a form as to support the plate '75 but so as itself not totouch the shaft '44 or its bearings. The ring '74 maybe secured in the plate '75 in any suitable way but'I prefer to make said ring peripherally with a slight taper and to force it under pressure into the plate 75. The sleeve 'or cone '72 is prolonged leftward so as to project out beyond the ring- 74 where it is made with a peripheral groove into which awire ring 7 '78 is sprung so as to prevent relative motion be tween the parts-72 and 74 to a sufficient extent I to allow of spilling the balls '73.

Near its right-hand end where the shaft 44 "passes the plate 14'said shaft has another cone mounted thereon, this one-being in all respects like cone 72 except that it is notinternally ta- '14 by meansof screws 84, Figs. 1 and 3,the plate [being located accurately by means of dowels 85. Cone or sleeve 80 projects rightward'through the ring 82 and is providedwith a retaining wire 86 like the wire 78. The cones 72 and 80 face in opshaft pressed into snug engagement.

pered, but has a fairly snug fit on the shaft. It"

in a special plate 83 which is secured to the plate posite directions and the two bearings may be said to be opposed meaning that the rightward pressure on one bearing is in the nature of a reaction 'of the leftward pressure. on the other.

A collar 87 is mounted on the shaft 44 just inside the cone 80, and is securedto said shaft in including not only the cones '72 and 80 and rings isslid' toward the. right under a suitable degree of pressurapushing the sleeveBO beforeit so as to bring about a firm contact, between said sleeve 80, the balls 81 and the ring. 82. Holding the parts in this position the clamp screw 88 is tightened, leaving the ball bearings at thetwo ends of the This will make the bearings a little too tight and special I means are provided to relieve them to exactly the right extent. In the particular form shownin the drawings and which I prefer to use, this means consists of an adjusting screw 90, Figs. 2 and 4,

threaded through the frame plate 11 and bearing at its inner end against the bracket or lug 18. After the bearings have been put in place and adjusted by the collar .87, as above described, this screw 90 is turned with a screw driver against the lug l8 whichslightly springs the platell;

where the shaft will be turned readily by the,

mere weight of the parts hanging from it. It is the work of but a fewseconds to adjust the shaft so nicely that it'turnswith perfect freedom, offering no appreciable resistance and yet with no sensible lost motion in the bearings. Adjustmentof the collar 8'7 is done almost instantly, requiring at most but a few seconds; and a slight cautious turning-of the screw 90 completes the adjustment with almost perfect precision. The

result is that the shaft turns as said above per-.

The bearings for the diiferential shaftf54 areexactly like those for, the shaft 44 except that the taper 110 is at the'right-hand end of 'the shaft 54 instead of the left-hand end andexcept furtherthat the ringslll and 11-2 of these bearings are pressed with a force f t directly into the frame plates l5and 16 instead of into special plates. In actual manufacture these rings and cones would be made exactly the same as-the corresponding parts for the other shaft in order to avoid multiplicity of different kinds of parts; ,7

In Fig. 5, the right-hand cone having the taper in it is numbered .113, the left-hand cone without taper 114 and the. retaining wires 115. A sleeve 1 16 split on one side and'provided with a clamping screw 117 is fastened on, the shaft. 54 just ened in precisely the same way as the collar 8'7 on the other shaft, and-with the same result, namely, that it makes the bearings a little too tight. This tightness is relieved by the following means, Figs. 1 and 5: A rod 118 has its reduced and shouldered end projecting through the plate 16, the shoulder bearing against the lefthand side of said plate. At its left-hand end this rod terminates short of the plate 15 in a cone 120. A screw 121 threaded through the plate 15' mounted and adjusted with the utmost precision in a very brief space of time.

Inventions that are shown in the drawings of this application but not claimed herein, are described and claimed in the original application of which this is a division, and in another application which also is a division of said original application. I

Various changes may be made without departing from my invention. 1

What I claim as new and desire to secure by Letters Patent, is:-

. 1. In a computing machine, the combination of a shaft having opposed ball bearings, means to secure said bearings to said shaft and framework and including means adjustable to apply an excess of pressure tothe bearings, and an adjusting screw acting on the stationary framework in which said shaft is mounted to spring said framework to relieve such excess of pressure.

2. In a computing machine, the combination of a shaft having opposed ball bearings, each of said bearings comprising a member on the shaft and a member on the stationary framework, one of.

said members'being slidable to a position to put an excess of pressure on the bearings, means to secure said member in such position, and adjustable means to spring the framework to relieve such excess of pressure.

3. In a computing machine, the combination of a shaft having a ball bearing cone fixed thereto and an opposed cone slidable thereon, rings in the supporting framework for cooperation with saidcones through bearing balls, .a collarslidable on said shaft in contact with said slidable cone, means to secure said collar in position when it and its contiguous cone have been adjusted to put an excess of pressure on said bearings, and adjustable means acting on said supporting framework to spring the latter to relieve such excess of pressure; I

4. In acomputing machine, the combination of arshaft, opposed ball bearings for said shaft comprising bearing members secured to the framework and bearing members secured on said shaft, means whereby one of said bearing members maybe adjusted and secured in place under an excess of pressure, and means for effecting a fine adjustment of the bearings by springing the framework to relieve the excess of pressure.

FREDERICK A. HART. 

